.brandIntroduction_tab {
    margin-top: 5%;
    display: flex;
    width: 100%;
    li {
        flex: 1;
        text-align: center;
        height: .8rem;
        line-height: .8rem;
        font-size: .26rem;
        color: #000;
        transition: all .3s;
    }
    .active {
        background: #d0121b;
        color: #fff;
    }
}